STMicroelectronics

L4940V12

L4940V12 Description

The L4940V12 is a linear voltage regulator IC from STMicroelectronics, designed to provide a fixed 12V output with a maximum current of 1.5A. It features a single output configuration and is housed in a through-hole TO220AB package. With a maximum input voltage of 17V, this regulator is suitable for a wide range of applications. The L4940V12 is REACH unaffected and RoHS3 compliant, ensuring environmental compliance.

L4940V12 Features

• Fixed Output Voltage: The L4940V12 provides a stable 12V output, making it ideal for applications requiring a consistent voltage supply.
• High Current Output: Capable of delivering up to 1.5A, this regulator is suitable for high-current applications.
• Low Voltage Dropout: With a maximum dropout of 0.9V at 1.5A, the L4940V12 maintains high efficiency even under heavy load conditions.
• Robust Protection Features: The regulator includes over-temperature, reverse polarity, and short-circuit protection, ensuring reliable operation and longevity.
• Excellent PSRR: A power supply rejection ratio of 61dB at 120Hz ensures minimal noise coupling from the input to the output.

L4940V12 Applications

The L4940V12 is ideal for applications requiring a stable 12V power supply with high current capabilities. Some specific use cases include:

• Industrial Equipment: Powering motors and other high-current devices in industrial settings.
• Telecommunications: Providing a stable power supply for telecommunications equipment.
• Automotive Systems: Used in automotive electronics, such as infotainment systems and power management modules.
• Power Supplies: As a core component in linear power supply designs, providing a reliable and efficient voltage regulation.

Conclusion of L4940V12

The L4940V12 is a versatile linear voltage regulator, offering a fixed 12V output with high current capabilities and robust protection features. Its low voltage dropout and excellent PSRR make it suitable for a wide range of applications, from industrial equipment to automotive systems. While the product is now considered obsolete, it remains a reliable choice for applications requiring a stable and efficient power supply.